Nasal flu vaccines are widely used. For example in the UK, all children in school are offered a nasal flu vaccine every year [1]. [1] https://www.nhs.uk/condit

Nasal flu vaccines are widely used. For example in the UK, all children in school are offered a nasal flu vaccine every year [1]. [1] https://www.nhs.uk/conditions/vaccinations/child-flu-vaccine/ https://www.nhs.uk/conditions/vaccinations/child-flu-vaccine...